Charging socket, charging plug and charging system

The invention discloses a charging plug, a charging socket and a charging system. The charging socket comprises a hole and a first clamping piece; the hole is formed in the end part of the charging socket, the hole is matched with a conductive terminal of the charging plug, a waist-shaped crown spring is arranged in the hole, and the waist-shaped crown spring is used for connecting the conductive terminal with a charging end of an energy storage assembly of a vehicle; the opening of the hole is provided with an extending section extending towards the center to form a clamping groove, and the clamping groove is used for fixing the kidney-shaped crown spring in the hole; and the first clamping piece is connected with the clamping groove in a clamped mode, the first clamping piece is used for being connected with a second clamping piece of a charging plug in a clamped mode, and after the first clamping piece and the second clamping piece are connected in a clamped mode, the first clamping piece and the second cl